'I am going to bring down the house': Kim Zolciak's mother threatens to set her daughter's mansion on fire during her wedding day

Her mother has been causing problem's ever since Kim Zolciak started planning her extravagant wedding to now-husband Kroy Biermann.

And while she promised to behave herself on her daughter's big day, Karen Zolciak has yet another meltdown at The Real Housewives Of Atlanta star's wedding reception on this week's episode of Don't Be Tardy For the Wedding.

The mother-of-the-bride threatens to burn the 34-year-old's mansion down when security will not allow her to use the bathroom inside the house and also verbally abuses Kroy.

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Bathroom breakdown: Kim Zolciak's mother nearly ruins her daughter's wedding reception when she threatens to burn down the house because she is not allowed to use the bathroom inside

Weeks before her big day, Kim had instructed guards not to let anybody inside her sprawling abode except for herself, Kroy and the children.

She wanted to ensure that the couple's infant son Kroy Jagger Biermann Jr was not woken up by noise.

In order to make sure her guests were comfortable, Kim made sure to install a $5,000 luxury porta-a-potty in the grounds of her home instead.

Outraged: The Real Housewives Of Atlanta star is left fuming that her mother is once again causing problems

But it was not good enough for Karen, who on this week's episode demands that her sister Leslie be allowed to use the private bathroom instead.

After being turned away once by security from the house, Leslie returns to the reception to complain to Karen.

'I went into the house to use the bathroom and security said "No"' she explains. 'I can't use the bathroom. I'm not using the port-a-potty. I don't think so.'

Karen decides that she will take matters into her own hands and goes back to the house with Leslie in order to demand answers.

Complaints: After being turned away once by security from the house, Karen's sister Leslie complains to her about not being able to use the toilet

'We’re going to draw the line in the sand right now,' she says.

But as the two women enter the premises they are once again told to leave.

'I am Kim's mom and this is my sister and she is just going to use the bathroom,' Karen rudely explains to the guard.

But the minders keep to their word and refuse to let the ladies in, leading Leslie to launch into her own verbal tirade.

Ready for a fight: Karen decides that she will take matters into her own hands and goes back to the house with Leslie in order to demand answers

'I would hate to get violent with you but seriously, this is her mother,' she threatens.

'This is what they asked me to do ma'am,' security in turn tries to explain.